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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '016e9c11889e47cdfcb647b97db5b8e0fb79fef0561c4b269e4b058aeaf3af10' 
  AND token = 'WSBg7DgUyLazUsUAY23x96tFP1/2g0ocu8/2nuPmEGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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