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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '389332b204b2e0a00184a41ebe15282c96b22bd4b4b878a4537567e39b66adff' 
  AND token = 'yazOPJy0PA0Zw756ZEhckY4xzCXaj274HJ4PQSU+dic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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