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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49fc6108d401ab3e9d6ca1797ac3614572cd09d098ffdad38ded0bca7d8084d5' 
  AND token = 'J+YXiE7MAMfJFIr436anU2a4FPFyuJOAeR9jnzm/7Xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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