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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32c03733701d54fb1acea699a12392f595829a739aab250e3776e37166744ce7' 
  AND token = 'qsc/q66AhD5BWnfbXDXk+7RIhBUlZ6Q7nrBSKw1ghTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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