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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6db67d51e707a7da40bfe63ebf1b9e84acd16fc95e96a33ba72e576bbef6cbce' 
  AND token = 'FFJ2kqNkaKI1IZUR4RkKdocYtTFcEP/3DheH2IkKsq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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