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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7c163d59972c472853f5b1c52b83a6ff72f4a99d54be1ad17e1f58e206c66e0' 
  AND token = '3T1bofouBanhB4hqKhyWL8heViGKu2NdPpsI1k6EHow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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