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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec90e59f1cace48ae34efa3ededd24421dcfe8f3e926a8974d7740b565f2b2cf' 
  AND token = 'JnjQvQ3+EBxvC5gzNIvoRB089M0W81N6Mef1o3FrP88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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