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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '462477421b7a2688625d2c4004f0740a5db3053d033806beb1f60a575ee6d50b' 
  AND token = 'MYfKoByiLNmNhFzoYOMW56mpFmoGVFe+fkTZYrlUj0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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