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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76fa32f78e6da7ca4f0cad9a4b2ca7ffdf93c4f7bce4a3308df2f23a5f5e45f5' 
  AND token = 'wUG5ziolUMiuqVIqjyOqHNj34VnAHhUImg+GB2g3c/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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