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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28e452f117098370951e89883bfedb768bf7a96a6b1d338f6e1496775a157040' 
  AND token = '7xHmvGwo/4H4PI8CojymC04SPzKPbeK/7emgJCy5PZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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