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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b4f52203e9231131f7c45bba01ebb63d8f6431368c67be0dfaea3f77e9acf39' 
  AND token = 'gVQXDKDYNOOnLun69GMHmo86jrDaxBlB6p4Kxcmtp7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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