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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f0546d38feb334b3f017dd6d758b633222c2edd3d11ade262b9a61d783973ee' 
  AND token = 'tLPbdsxV93/UAQagyT7RzgwGiH6WQNURpx5In+sZTYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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