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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fc6aba2bd720d2d89929826810ee0e6d58a0b7f991ccc9ee077e9e63e56c8c0' 
  AND token = 'zbCTkbEfulOWXo2q249bpGb3T2MParuTh4skBZkNUGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00160

JSON explain

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