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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12876804415bb8756de3af882a5c19cf4e3c7f83d138b57dc736a9d7620683fb' 
  AND token = '85LV/4eh+kpUSg8BcVNMhoX7EhRZ53t8svXNpicGOng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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