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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92b7c670e3f86a1b43c26d34a382775a761ea36056b54332328b71e03d6d9de1' 
  AND token = '85+d7icLavLdWwKlFLeOGt7Hoax+OYm0rVydXc2u2DE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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