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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec27862465a2a7089153fe9da2d666757c3f1c1501f2e2dd28a06936d962a79e' 
  AND token = 'wQa2TOBkR3Y+k5Ks2QYsRV1brOpjKDDoUk4s2jxdyXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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