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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3b2dca514e9bc7be5097b34f930dda785a75911cdbdb77f9750525fc1aa892a' 
  AND token = 'Ye+8yveZkh+Hx5JDE09oiPUx0P0+ymtkLEjUvL9Wmmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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