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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7634e93f1853e13e52cec5ea3e72922ad0d8bb9d467684f5f6af7d4367180fb' 
  AND token = 'yUijVMgErmk+mo5UieEKHCb7jQDS/wXd0E+JrMMHaGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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