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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39ca54cbadbf5ca1b76c952d4d2f121edc5c9bb2d47c321316c740378f63fe28' 
  AND token = 'kDno9UHdyQKff6mGGlzxH0Wt/1FaQ2Siz0Hazosag+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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