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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12b494dd671403371d6cca088cb71eb3a8158e9ac545df8fab01f05ce55e6301' 
  AND token = '3nhEduXkR0rrJ6VEMCtkkDcLQ4h/VQ/QMm/FEF4xfOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00112

JSON explain

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