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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a7e798b0f03a5f8dfceb4b1ff907f3ffa33afb2526f2974524e8c6b15b23aab' 
  AND token = 'EE4ifJR1tCbebpsddUN7aLOFDAnh/J252LIWfITPOhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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