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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ab85c33ade2ef2d36abc1895adfdc25ace9e8556d838e11e31fe227ee43a79d' 
  AND token = '4Dk5jc52c607/wTW8Hfw52IfXG0yYQmmSHwdso0q8ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00094

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}