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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1db4db1c46a1a3219396dd267db7e931809795cb60a16832bc0fe09632e38373' 
  AND token = 'p9hcaZhZ3Jza9xtbwcYWESP8OVNeP3Wgz2RiNPOa1rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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