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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41d47274cdb320ed1f5706c519c2a5576d58ba1a712ebdea6ca14836d7989ea2' 
  AND token = 'Pa6R522G2IdZ4gqBan8hAjMtfgAr9PnDFPr5H3iIgFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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