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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '107d3fd853918c5b826db98aa455da98fa929e6778494e62e57f4e488c16c501' 
  AND token = 'SLxXooSDVmefIVGpDE+BJ19GuouS5ZNQUt3acFTLs2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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