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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de3cfc258da13a74c1090f0763a71af68cdedeced6589c86c2f45e1ffdbbc83b' 
  AND token = '7Sg9NQ7VGJbk2xrdK4vwNZ8DIpITg1TFSO9Lm5Ls8V0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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