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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68183d5a4947e731632122ac383ad1810b7a6df6d9d60f9f7094ceb9423c87d8' 
  AND token = 'jfenLs3rwWH6hz0hubuRglWxzi9e6lYmOOpJR9jBSgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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