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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'addee2b8e3d44acfca8a4c2239c1ba6f13e415f72e523a5ec686edc311b7d70f' 
  AND token = 'B9Xa8TsLe83/xgqFSlvrfwP+1nv1uOTdOEdd0lY78h0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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