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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea96adcd7b2f860d8bc02bc7f56101caa551d3439bf319c283821a2ccfbb6201' 
  AND token = 'pv4yk3TMcZz/x+GudLQ5muH0axpOx09U85Fm0yFyz3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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