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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '702726a5748c7d3a87300a941c71fb3b43b996dcd153c27ea7ad6046027bc0b3' 
  AND token = 'VjyLk3X/zjqeIxiS5U1iIpWS88ZrZtuAAZ06wyOySVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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