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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d23dace3340cd1083bdac134439cb725b250094a2b2363175afee3a380b0c5a' 
  AND token = 'Ou0wYYhV7XuwfbJy6UDR4L1UHBz2d9W53QDbpyzolUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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