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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66a97b8029f19e84222162d03a89713d4cca40a3454d439c41fc6652b1b431c0' 
  AND token = 'Z/6SHGgpwuD6P+0DIAYiOF+tIF6hvnO14a56tzTpLEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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