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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a7e07ebfbd41e94b8b5e01c779f4a73495cbf7eef0803c3444470125f03b03b' 
  AND token = 'YVCLW1oD7nFkyc4RciDp0Q55cIEvLl5Rb92hzb2VlXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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