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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e4b9202a0f8a7ff13a5168e7590cf17704c7e27e5df8029aa1924e9b11fa7ef' 
  AND token = 'Bf0Tg+JqsWjORV+okXVs+D0oncU1bObridJdNKormbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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