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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbefd6baab1f1b4697fe2aae4b9ef2f4b9ef58b6303cfdca479f689575175f4f' 
  AND token = 'g0D8GhW+Gn/NBvlEAgNPlJjGyDdO+uH/N147raTCb5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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