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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3bff0129d2138a520d288ec335988675bd6dd2446037cf43b0c5ad3a3604d56' 
  AND token = 'jxoOZ+3qh5lCZhNl8WggDkn7geK2FrEIn0nl0tTLmgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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