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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89e3e563ff285558063b7c4a62f05f2cc2ba927cd3757d3c94e3cf875b82c2e0' 
  AND token = '3UzVzNhL+Pa5H/QbsSnRpoBabbmuSzdzAVk9SkVLovE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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