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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '998147934564ed4322f5da6e0e0c01d5b6284539c84aa5b8aa62656ef0333361' 
  AND token = 'luPOJO+MGg25xonY7vp168KbiEffueK7EgHi8cw40QM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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