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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c96a161c65ccc533cc8244fb41f98750ba167e8a285721f9c87ea67bfad8375' 
  AND token = 'kDNf4R1zK0kQ24fB7XBgzgUpjeY3rZUY4sqfUJ3IEOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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