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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3c328164107b3e89f9b5063b91ef62ab58fadf96459cd6048e40ccec96b36fe' 
  AND token = 'Bl+J64jLqP8dhzr8nGJ7K6+I91BSM0z7cRkq1Z9G3bA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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