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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2fe6a16ba2172bc22d28ac6bdc94a006bdd56be120f3539265971125dd3b91a' 
  AND token = 'ca3sAyDpOUYZRnQd6/h6NLgwqvsdx9FzhLnpSsOEbK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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