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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e767f342b59fa81b1bbae04e4543d2dedfc3b635958291f5db64557ddc5123c' 
  AND token = 'sCVY60qOGQ7MjVaMJtdtIn/qEicVIJ5bBKDRck3u0GQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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