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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba493e1b3dcab2f04a146193ed48a2da0d53b7e564aeaa55599ac58f8b012f74' 
  AND token = 'lj/jPk0IPnkbyq7rOrVfkwovY+4WAny5uOLh7PJa7jY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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