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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e13bd5f808bdded41f46ca356ff700b8b671ca534992fd223f1c7a6495b4de86' 
  AND token = '56kTP36id15RzYNKKonPWF9X0v5gwh0kgHs40n7IUmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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