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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '383482f0dd7f994f2dabe97daf4c6d413405e5e842be747bb2dbe9a7d42219f6' 
  AND token = 'NmJbBIlpNs8cWdiiENAV/y2Ah4FkodFVnVpHagp9LCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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