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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95d835c9cbc3be052c324744e0bccfcdafbfce4dd2675df9a5ef0dc069f9fc1b' 
  AND token = 'jdppnVNuopp3MYj3GkRD9XLbMzj4FWQ8zjxaDSLetgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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