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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d704ff87a648a1ff8666e38650e0d11e84e9413fb7f576c4559f1a187c5fc6e' 
  AND token = '8pr+bKXZo8JlYEmyLccxp7fxMwyeoE8bW3SXr1Tw2uU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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