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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d309c44b8555b603ff9598e6cbf7bf51f496073c36d3e32885a5de42f56a833' 
  AND token = '+VabBn+ezfbHVDqk0+19B+kk2T9yqXRS7MK/1+xorNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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