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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3d56e09eda18f30bdaa3ac90791614e773ba9b129c6f928b585a302da6308dd' 
  AND token = 'zSYiXSRsqmnCwM0YENOU0S/BD03XHRPN8nTDeFmUsT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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