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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c29a42d48c8b9ffa0bf43e51de25abbb72dd886cca8122fa3f58d5cc2e071322' 
  AND token = 'v9hpbvtT9Wkw4cl3k4Y4TAKKJQH0dVHkGFnoq9Mrrq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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