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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '468aa4a10dcdcb95eeb7d96915b3fbd44cfabda8fd03e9c501e87b35ff08ff04' 
  AND token = 'Y01vCqI0bd2vSEiGiKRen2cS/Z8iXOqC2oyaf/Kd6YA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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