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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c413c7faadf60ff798a69018eb895804869455fc774027988ac86eb00f201e3' 
  AND token = '1upgEUGy50Nd94M9UOBtkQqeLD9lG1SJ/awVwTubzrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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