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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d9c2a1a2f6307646876e513d329ce63710411f89cbfee6ba0dd58a9afbd47ba' 
  AND token = 'cx63C77dLxohpqahxmlwhoQPERWsVMGA90x5meu1gvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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