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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62465000993088153f769f06f1e8d84724ded7ecc495f008a3b48411c4e6c362' 
  AND token = 'enK7J73Ct7i6BTk2GidWE8cUR0XLEm+j7oOir7NSEkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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