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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '011e2d57aa3c5e75bcecb84211cd78ddb18db87be3db951dc73b3f45e096ebae' 
  AND token = '9hQGmk4A6NYMBbuUiW3hZoP+eWIVGQ8b7+y49Req29s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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