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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd66a0aee37ae3119941f12c46a83028b44e6842937ba21aa9d80722f63bee27b' 
  AND token = 'HRmH/a1UCK8S33m2d4AFVbOddTSR5Glog6DS6MqbIco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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