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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f6efb53094d24eff3a5317c0846c22c5592e873a8abd2b670987e0ad44fc7cc' 
  AND token = 'xNvXe1mim7Obbkjz4a9LUzMamw01xgDqDPM3GeBXrxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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