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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1153f5cde363c6e4bd826f1279d93c38b856ec7bcf58418b539b5760a50469f7' 
  AND token = 'vjKDuBKrtE47OA2l/wlN8FAPnRnsW4ru9QuEaZoNA/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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