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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32dfe8a88a3d23d50d4bb1c8a789a6b84a0caf39414dccc82bcaec1c2b9384e9' 
  AND token = 'wV857dYyo+dQ23KymR3UBlHFWoYnl0XSbsYWiDg2Dk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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