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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd099227aecc63c31b897f66274dd008717a2e0af288d1b46b53ca6f8e56a2e87' 
  AND token = '2dXjFNfu42GJru7FtsJhJTdf9+Fn4nJ/oGA4e+C1RUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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