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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '945a7139fa6909c0382ba43440885b8397beb6ca6301b23a41c4f975b084d4e6' 
  AND token = '4eKEAPhd6tlDNHBgdK31ZpZDsIUT+uQj1Zcy/Daf7mA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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