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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ea943e5df9ec0dc630aae0c8942351d59f7b419f535c8feba6cdfefde2f820f' 
  AND token = 'iKZHkz/5PVAbaQgwbj2B7gyR7a0vUdn2cuW0mPOxLHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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