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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5260db5f773657201177183e823295a5586160a38434c241cd2d138a43c9ea8e' 
  AND token = 'YKDd5ytoVTmvNc8FVtm2k7OA2IssneKhfnatMBHOV+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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