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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47779810b9d7be36c44dfb32c5e2b2d6a493bb733929c2d4ef14f004972d5d46' 
  AND token = 'tfxHhveC2EJUoev60SCRZcYPkDQdHkkGjNpHSMq9HM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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