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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c5f063ad918ea8a9e049c0887570cc44e03a5f59ef0bdadb9ce3b50cd2eaa15' 
  AND token = 'qmZGgnRnxx7MlOcJLJDBZZMaHnMFMSXnmIbUozmqZSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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