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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '840f906766be91bca40fa9d66be4f76b8b1a9da98d5d511ab3d25c9a7e5db42b' 
  AND token = 'HhBHUwEnPAYyAvsXMwjfp0eockkjIq79ubovAwmegac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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