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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1828dcc56cab6561dae82dbc70a81d4848285172e3c2af7a5960b3f69320bb6f' 
  AND token = 'e/ioQSYFQjU6FBGfDsu8TlTCWMyg6RU2hWD8Mhfdaa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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