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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77dbfa5468735ea2917d533867855e9ebb336191a7d9cb4c606fe774b9811b07' 
  AND token = 'DbB6uvFiKTcCn1Y8grlZIKA7WsIT8QXGjKtLDLsY1I0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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