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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3ffb1856d4c253f9720a0e5787e4746cf754a5b23d265318d99d87edd0918f7' 
  AND token = 'BU3Ff+zmBYF0PQkL0UyqaItO1HMDpW6vErs95WmFsgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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