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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a57c5321d1c09bed6328f7dd22ceb4f2d34ed1e61315da4a38280f852311ba8' 
  AND token = '6+e0dbtO9YVzwvPnaN2o6yWeiaNY5TOMuTFdicv60wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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