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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14ace40e9b4c8604d5b89612d0f7eaf99cc6eae136dba0212e1f1b08b64f8378' 
  AND token = 'CfZPb+TG729PQtCIF/4j6vlKf2JfZtM4ZDv7QimMrek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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