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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0322f63415f5fd10e7aa13b62d7753afc08e40d103eeebc0c85a10acbdb90ee3' 
  AND token = '+bR79LwqRrq2oRLr5AWqH7eNC+4/+AjjOUIl2CbB6y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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