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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b5614d4852f4bfab88942b6cc01a30db11180961ab9e1fa035685ead7826464' 
  AND token = '1+NhKiTiXySM+4Ow7tcZbfnknZkr1C0+1Q/HkQSnaZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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