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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '681fbac257e043189ec118ab15c3e2dc927bec9f7691c0243a430d08e4d87542' 
  AND token = '1nM9RPNhdxrtV1XnA7vFsVZtO7UY0g0++Qs7L9Csgbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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