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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc1b629a5b50e19d7863c4b3d20c4490910691b1124ba92dfb17b3843667386b' 
  AND token = 'ZJyrDo2ViH7bjC3dEsOMVnGjHLrPDG/Hy22ZnaH1n38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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