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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbeb686bae72a74468cbc8daf26c56846381b3988cb3664094e88c348781c792' 
  AND token = 'OxYQmEdHTmdZuJzKVL798NaaMTd+km8q6jv/v+AyPog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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