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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '823d595b48e933c5b8b90b621a1e79cff7c983fde59d9111eb05926db0c43f9b' 
  AND token = 'n5EiF+Xhu9Z6j9YlkD7LCcZL4J7qC7YSPhfcV25oBYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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