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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98c4d1a415f07dd3959952f35363c3712c638d1d31694a162c7bb69c1fa22357' 
  AND token = 'LIcJCY1SuJk/u6vPRrL+MTzze5yrU+1g//cmEBY1x2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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