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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99ee0b5747a836a7916eb3e8ed7e64f938ca4fed9262d5ed5ccff66242ec17b9' 
  AND token = '/coyJScY0+wlQOaZT87qNVt1oMxQf2BRBCv0/IJu+bM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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