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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b3d0d7e9a5c2adb73ec063263f0514136d5b3efe2aa8d4fe3fa22f4eb53db1e' 
  AND token = 'J9Ytgt0LvdAeleNesK4mVvd3k0/UZqM2xiamUOefhBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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