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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fb7fbfb9a9ab8a5876466e563b6173a7fae9a5b2632553804639eb2334b2f72' 
  AND token = 'lIy8MmIrAXXPMl/8tEtmkznI2Vlf947i2Jubsbh1fHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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